I've got one of these, series 6, but where your's says model number mine got 200 watts written in it, or so it says, it's bloody loud I know that, fine amps as are all the Trace models, I've also got an SMX and the writing on the back of that is nearly ineligible, depends what pen they used at the time 😊.
The weight might be a clue to wattage, mines a fairly manageable 13Kg and hasn't got a fan, but the higher wattage ones were a lot heavier with a fan,